diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8281c88..1aada51 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v6
+        uses: actions/checkout@v6.0.2
       - name: Run markdownlint-cli
         uses: nosborn/github-action-markdown-cli@v3.5.0
         with:
@@ -37,7 +37,7 @@ jobs:
           - "3.12"
           - "3.13"
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v6.0.2
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 81a9b37..cfdeb5f 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -24,7 +24,7 @@ jobs:
     needs: wait-for-ci
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v6.0.2
 
       - name: Set up Python
         uses: actions/setup-python@v6
diff --git a/.github/workflows/sync-test-fixtures.yml b/.github/workflows/sync-test-fixtures.yml
index fa65a0e..5e1cd1c 100644
--- a/.github/workflows/sync-test-fixtures.yml
+++ b/.github/workflows/sync-test-fixtures.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v6.0.2
       - name: Sync fixtures
         id: sync
         run: |